While most middleweights of the early 1980s were focused on outright speed, the Kawasaki Z 550 GT carved a unique niche by introducing a low-maintenance shaft drive to the 550cc class—a feature usually reserved for heavyweight tourers. This engineering choice transformed the KZ550 platform from a standard commuter into one of the most reliable long-distance ‘light’ tourers of its era, enjoying a production run that spanned over a decade.
| Quick Specs: Kawasaki Z 550 GT | |
|---|---|
| Production Years | 1981 – 1994 |
| Engine Type | Air-cooled, 4-cylinder, 4-stroke |
| Drive Type | Shaft Drive |
| Oil Capacity | 2.5 L (with filter) |
| Battery Type | YB12A-A |
| Spark Plug | NGK DR8ES (0.6-0.7 mm gap) |
Technical Review: Engineering for Longevity
The KZ550B/G series is a masterclass in the ‘Universal Japanese Motorcycle’ (UJM) philosophy, refined for the European touring market. Its air-cooled inline-four engine is renowned for its smooth power delivery, though the real star is the shaft-drive system. Unlike chain-driven counterparts, the GT required significantly less roadside maintenance, making it a favorite for high-mileage couriers and all-weather commuters.
From a handling perspective, the Z 550 GT utilized a sturdy steel cradle frame and air-assisted suspension, allowing riders to adjust the stiffness based on payload—a critical feature for a bike often laden with panniers. While not as nimble as the GPz550, the GT offers superior stability and comfort.
Maintenance Guide & Essential Data
Maintaining the Z 550 GT is straightforward, provided the owner adheres to the following technical specifications. Regular oil changes are the lifeline of this air-cooled engine.
1. Lubrication System
The engine requires high-quality mineral or semi-synthetic oil. Given the air-cooled nature, thermal stability is key.
- Viscosity: SAE 10W-40 for temperate climates; 20W-50 for warmer regions.
- Specification: API SE, SF, or SG.
- Capacity: 2.5 Liters when replacing the oil filter.
2. Wheel and Tire Specifications
The GT uses a specific 19-inch front and 18-inch rear wheel combination designed for stability.
- Front Tire: 100/90-19 57H (2.0 bar / 28 psi)
- Rear Tire: 120/90-18 65H (2.25 bar solo / 2.8 bar heavy load)
3. Ignition and Electrical
Ensure the spark plug gap is precise to prevent cold-start issues, a common quirk of older multi-cylinder Kawasakis.
- Spark Plug: NGK DR8ES
- Gap: 0.6 – 0.7 mm
- Battery: 12V YB12A-A (Lead-acid)
MotoSpecsLab Verdict
The Kawasaki Z 550 GT remains a testament to over-engineering. For the modern collector or vintage rider, it offers a rare combination of classic 80s aesthetics with the mechanical reliability of a modern tourer. Keep the shaft drive oil fresh and the carburetors balanced, and this machine will easily surpass the 100,000-mile mark.